Portion of a display screen with transitional graphical user interface



FIG. 1 is a first image of a portion of a display screen with a transitional graphical user interface showing my new design; and,

FIG. 2 is a second image thereof.

The appearance of the transitional graphical user interface transitions between the images shown in FIGS. 1-2. The process or period in which one image transitions to another image forms no part of the claimed design. The outermost broken line perimeter illustrates a portion of a display screen and forms no part of the claimed design. The remaining broken lines illustrate portions of the graphical user interface and form no part of the claimed design. 

CLAIM The ornamental design for a portion of a display screen with transitional graphical user interface, as shown and described. 